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			<p>属性选择器</p>
			<h1>静夜思</h1>
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				<li lan=''>忘记了</li>
				<li lan='a'>忘记了</li>
				<li lan='abc'>忘记了</li>
				<li lan='abe'>忘记了</li>
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			<h1>后代选择器<span>儿子</span></h1>
			<p>我是选择器<span>儿子</span></p>
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